#include<stdio.h>

int main(){
    // 正三角形判断
    int side1,side2,side3;
    printf("Please enter the lengths: ");
    scanf("%d%d%d",&side1,&side2,&side3);

    if(side1 == side2 && side2 == side3){
        printf("Regular triangle\n");
    }

    return 0;
}